A very intelligent Causcasian friend once said to me, in an obvious effort to get my goat, that "All you Chinese guys are so stuck up proud that youre so 'ethnically pure'. Hah- I've got news for you: all you Northern Chinese are mixed with Mongolians, Manchurians, and Turkic people; all you Southern Chinese are mixed with Polynesians and Europeans!" Now he never mentioned to what extent in either case, but after we ragged on each other a bit, I went back and realized he had a point. (To which, when I told him so, he just said something to the effect of 'Hrumph. I know I'm right!')
So, CK, you're not off the hook yet, because, now, especially in the U.S., there's much "Chinese intermarriage" (boy, how racist can you get, when you can make such distinctions among 'your own kind'?!!) I'd assume it's similar for Koreans, Japanese, and all Latinas. I just hope this doesn't make us all rednecks.